Add damaged file

[MartinThoma]

See py-pdf/pypdf#485

[stefan6419846]

There are tons of invalid/damaged PDF files in the wild. For this specific issue: Generating such a file is trivial with https://github.com/py-pdf/sample-files/blob/main/002-trivial-libre-office-writer/002-trivial-libre-office-writer.pdf for example - just remove the startxref entry, which yields you a file like 002-trivial-libre-office-writer_without-startxref.pdf or broken.pdf (simpler document with some manual cleanup, generated by LibreOffice Writer as well).

[stefan6419846]

Just for the record: Adding a damaged file does not seem supported within https://github.com/py-pdf/sample-files/blob/main/.github/workflows/json_consistency.py for now.